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Can GPS be used for indoor navigation?
GPS and GNSS relies on a network of satellites orbiting the Earth to determine your location. When you're indoors, the GPS and GNSS signals have to penetrate through walls, ceilings, and other structures, which can weaken or block the signals altogether.
The signals from GNSS satellites are relatively weak by the time they reach the Earth's surface, the average signal level at ground level is about -130dBm. Let's find a reference object, the standby RF power of a cell phone is -60dBm. The structures can further attenuate them， and the signals can reflect off surfaces indoors, causing multipath interference, where the signal takes different paths and arrives at the receiver at slightly different times, further introducing more interference to the positioning.
Therefore, in the vast majority of indoor environments, GNSS signals are unavailable and GNSS receivers are unable to achieve positioning and timing.
In order to have GPS signals indoors, we installed a GEMS GPS Repeater in the room, which provides real-time GPS signals in the indoor space, bringing fixed position information and real-time timing information to the receiver.
Although we have installed a GEMS GPS Repeater set, the GPS satellite signals we receive indoors are relayed from the GPS satellite signals received from the location of the GNSS antenna fixed to the roof. Therefore the position we are locking onto with the GPS receiver is a fixed and immobile position, and the GPS signal received anywhere indoors is a fixed position. So there is no way we can get an accurate position indoors. So we can not get a precise GPS location indoors whether or not we've installed GPS repeater.
Therefore any GPS signal that comes from space cannot be used for indoor navigation. But regenerated GPS signals can be used for indoor navigation. This system is called indoor pseudo-satellite positioning navigation system.
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